Not exactly reloading related but Im going on a fishing trip the end of the month here in Idaho. I have a choice between 3 guns that i reload for. The first in 10mm is a glock 20 pros are number of rounds in mag and speed to reload, the second is a Ruger new style Blackhawk in 45LC 300gr rnfp bullet,third is taurus 44 mag compensated with 250gr hollow point. Is there a formua for calculating energy from each gun. I know this is a rather broad request.